How Many People Are Named Cydnei?
An estimated 52 people in the United States have the first name Cydnei. It is almost exclusively a female name. The average bearer is 27 years old, and Cydnei peaked in popularity in 1995 with 13 births that year.
Below you will find a full statistical profile of Cydnei as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, state-by-state birth registrations, and, when available, a 2020 Census snapshot showing who had the name at that point in time. You can also check how many people share the full name Cydnei paired with any surname.
Key Insights
- Cydnei is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
52
About 1 in 6,591,430 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
27
years old
Peak Year
1995
13 births
Total Registered
53
since 1880
Gender Distribution for Cydnei
Cydnei is almost exclusively a female name. Out of 53 total births registered, 100.0% were female.
Cydnei as a female name
Ranked #10,866 in 2009
10 female births in 2009
Peak: 1995 (13 births)
Cydnei: Popularity Over Time
SSA records for Cydnei span from the 1990s to the 2000s, covering 2 decades of naming data. The most popular decade for this name was the 1990s, when 38 babies were registered. While Cydnei is less common than at its peak in the 1990s, it remains a well-established name with steady registrations.
Cydnei by Decade
How has Cydnei tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Cydnei + Last Name Combinations
How many people share a full name with Cydnei as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Cydnei
Other first names starting with C with a similar number of bearers.
Cydnei: Questions and Answers
How many people in the U.S. are named Cydnei?
We estimate approximately 52 people named Cydnei are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 6,591,430 Americans share this first name.
Is Cydnei a common name?
Cydnei is classified as "Very Rare" and is more popular than 54.9% of all first names in the SSA database. A total of 53 births have been registered with this name since 1880.
When was Cydnei most popular?
Cydnei reached peak popularity in 1995, when 13 babies were given this name. The average age of a living person named Cydnei is approximately 27 years old, reflecting when the name was most commonly given.
What does the SSA popularity chart show?
The popularity chart tracks birth registrations, not people currently alive. It shows how often Cydnei was given to babies from 1880 through 2024, which is why it is the best tool on the page for seeing long-run naming trends.
Is Cydnei a female name?
Cydnei is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
Why can Cydnei have a lot of living bearers even if it is not trendy now?
Because a name can build up a large population over many decades. Cydnei peaked in 1995, and the average living bearer is about 27 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
How many Cydnei Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Cydnei Smith, Cydnei Johnson, Cydnei Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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